<div class="col-lg-2 col-md-3  col-sm-12 col-xs-12 inbox-panel">
  <div> 
    <div class="list-group mail-list m-t-20"> 
      <a href="/restaurants/messages" class="list-group-item <%= 'active' if params[:is_read] == nil %>">
        所有消息 
      </a> 
    </div>

    <div class="list-group mail-list m-t-20"> 
      <a href="/restaurants/messages?is_read=false" class="list-group-item <%= 'active' if params[:is_read] == 'false' %>">
        所有未读消息 
      </a> 
    </div>

    <div class="list-group mail-list m-t-20"> 
      <a href="/restaurants/messages?is_read=true" class="list-group-item <%= 'active' if params[:is_read] == 'true' %>">
        所有已读消息 
      </a> 
    </div>
   
  </div>
</div>